Screening-machine for sand and gravel.



B. GARDIE & M. HILL.

SCREENING MACHINE POE SAND AND GRAVEL,

APPLIUATION FILED JULY 22, 1912.

1 @9 94 Patented June 2,1914.

2 SHEETS-SHEET 1.

WITNESSES:

.I Q WM W S E, GARDIE & M. HILL. 3CREENING MACHINE FOR SAND AND GRAVEL.

APII-IOATION FILED JULY 22, 1912,

1 U98,946n Patented June 2,1914

2 SHEETS-$11331 Z.

FIG. 5

WITNESSES: Im Ewrmzs:

.BYZAHZLATMRNEK' *UNITED STATES" PATENT cr mes.

Earn. GARDIE Ann MARION HILL, or scorn: sr. PAUL, MINNESOTA.

SCREENING- MACHINE FOR SAND AND GRIAVEL.

mosses.

Specification of Letters Patent.

Patented June 2, 1914.

Application filed July 22, 1912. Serial Nol 710,791.

, for Sands and Gravels, of which the following is a specification.

Our invention relates to screening machines for separating stones, gravels and sands in preparing materials for concrete, mortar, plastering &c. and the main object is to produce an-improved efiicient' automatic machine for said purposes.

1 In the accompanying draw1ng,1 igure 1 is a top viewof our complete machine.

I Fig.2 is a longitudinal vertical section on i the line aa Fig. 1. Fig. 3 is a side elevation of the machine shown in Fig. lwith most of the sand and gravel supplying mechanism to the right and the guard rails of steps and platform omitted. Fig. 4 is an enlarged detail side view of one of the screen frames and screens therein. Fig. 5 is an enlarged end efevation of the screens and their frames suspended by links from the machine frame, the latter shown in section.

Referring to the numerals, 1 designates the main frame of the machine and is provided with legs or supporting posts 2 which are of'snfficient height to permit any kind of wagons, carts or cars (not shown) to pass underneath the bins 3,

which hold the screened materials in readi ness' for removal from the machine through outlets 4;, which are normally closed by shutters 5 operated by handles 6 fixed in same.

As best shown in Fig. 2, the bins are divided into four compartments or'smaller bins, 3, 3, 3 and 3 for the-reception of coarse gravel, fine gravel, coarse sand and fine sand respectively. Above said bins are verse bars 16 which also support the screens.

' To Fig. 5 is shown that. said transverse bars drawings by reference may be angle bars in the lower part of each frame and plain flat bars in the upper part of each frame, so as to leave more room for materials between the two screens in each frame."

Each screen frame is held and agitated in a substantially horizontal position by a pair of eccentric rods 17 and 18 having straps 19. I

embracing eccentrics 20 and 21, which are fixed on a shaft 22. The latter is journaled in bearings 24 on the frame (see Figs. 2

and 3) and carries a fixed pulley 23, which is driven by a belt 25 and a pulley 26 that is hired on a shaft 27 the latter shaft has a 1 of the machine; the belt 29 runs through apertures in the roof of the motor house, and

in the platform 46.

Fixed on the shaft 27 is a. pinion 34 which,

preferably by means of an intermediate idler gear 3%, drives a gear wheel 35, which is fixed on a shaft 36 having near its middle fixed a roller 37. Said roller engages in the upper loop of an endless conveyor belt 38 whose lower loop passes over a roller39.

Both of said rollers are journaled' in an inclined frame 40, supported on trestle work In the frame 40 are also journaled a series of rollers 42, each of which has its diameter reduced toward the middle so as to form a single annular groove, the function of which is. to cause the upper flight of the endless conveyer belt to assume a grooved shape and in each groove carry thematerials whose weight causes the groove.

In Figs. -1 and 2, 43 designates a supply of I mixed sands, gravels and small stones to be fed to the machine forseparation. In said views is also shown an inclined, and in the middle upwardly bulged plate 44-, which is secured at 45 to the main frame; the" function of the said plate is tospread. upon the upper screen'the sand-and gravel passing from the upper end of the conveyor-onto the screens, so that the conveyor belt may be much narrower than the screens and still the entire width of the screens will be inactive use as soon as the materials are dropped upon them.

At the front side of the machine is arranged a platform 46 having an inclined ex- Cir tension 47, the latter With cleats 48. The entire platform and extensions may have guard rails 49 (shown in Fig. 1). From the main platform 46 extend steps 50 to a lower and smaller platform 51 in front of the motor house, and from the smallplatforni to the ground extend steps 52.

The operation of the machine is as follows: The machine is placed here the crude material 43can easily be supplied to the conveyor 38. The motor is then started, and as the conveyer carries the crude material upon the spreader 4A, the latter spreads it upon the end of the upper screen that extends in under the spreader. The eccentries then by swinging the links 7 and 8 between a vertical and an inclined position .(as shown in Figs. 2 and 3) causes the materials to move upon the screens in a direction away from the spreader and as i is obvious that such motion of the screens throws the mater ls uoward and forward clogging even it the materials are Wet, prevented, and the separating efiect is increased comoared with a mere horizontal Vibration of screens. Said. eilect is further increased by the slight rocking in vement of the screens, which results from a greater vertical throw of the eccentrics than of the pivots in the lower ends of the links 7 and 8 which support the screens. When it is preferred to have the eccentric shatt turn in the opposite direction of the arrow 7) in Fig. 2 the motor is reversed, the pinion 34 and gear 35 are meshed directly and the intermediate idler gear 54c omit-ted. All rocks or stones that are too large to .pass through the top screen pass over it and are guided out of the machine by a chute 53; the large gravel passes from screen 12 along chute 54 into bin 3; the finer gravel passes from screen 13 over chute 55 into bin 3; the coarsest sand -Wagon, cart or car by placing the car passes from screen A: and over chute 56 into bin 3*, while the finest sand drops through screen 1% directly into bin 3; and it any of 4 it moves past the bin the chute 5? will guide it into the bin; but. as a rule the fine sand is precipitated through all the screens before passing from over the 3.

As already stated, any of the screened materials may be loaded from its bin into the Wagon underneath the bin and opening the bottom valve or shutter of the bin.

What We claim is:

1. In a soreenin inachine a a suitable trains, the combination o ally suspended links, screen from ally suspended in the links, and ranged to more the screen frarn tical position of the li 's to from only to the 'ver i po 5 again,

2. in a so m chine a suitable frame, the combination a par of pi'votaily suspended hangers, a ser e1 frame trunnioned in the lower ends of the hangers and provided with one or more screens, a shaft journaled on the frame, an eccentric fixed on the shaft, a yoke eccentric, and a rod. rigidly secure; s end to the yoke and the other end screen f'B.lT16; said hangers being so an ranged relative to the eccentric that tswing between a vertical posi, 'n and a gosition inclined from one side only of vertical position.

In testimony whereof We afhx our si tures, in presence of t o witnesses i Vitnesses':

F. W Wnrxrwoarrn MARY L. "OKrnrn 

